linux-kernel - [PATCH 5/7] extcon: max77693: Fix incorrect error check and return value

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Date:	Tue, 20 Nov 2012 10:52:41 +0530
From:	Sachin Kamat <sachin.kamat@...aro.org>
To:	linux-kernel@...r.kernel.org
Cc:	myungjoo.ham@...sung.com, cw00.choi@...sung.com,
	sachin.kamat@...aro.org, patches@...aro.org
Subject: [PATCH 5/7] extcon: max77693: Fix incorrect error check and return value

irq_create_mapping() returns 0 if it fails to provide a valid irq number.
'ret' needs to be updated with a negative error code before returning from
probe to signal probe failure. While at it, also corrected the 'virq' type to
unsigned from signed.

Signed-off-by: Sachin Kamat <sachin.kamat@...aro.org>
---
 drivers/extcon/extcon-max77693.c |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/extcon/extcon-max77693.c b/drivers/extcon/extcon-max77693.c
index a17d0d9..2a0f397 100644
--- a/drivers/extcon/extcon-max77693.c
+++ b/drivers/extcon/extcon-max77693.c
@@ -686,11 +686,13 @@ static int __devinit max77693_muic_probe(struct platform_device *pdev)
 	/* Support irq domain for MAX77693 MUIC device */
 	for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
 		struct max77693_muic_irq *muic_irq = &muic_irqs[i];
-		int virq = 0;
+		unsigned int virq = 0;
 
 		virq = irq_create_mapping(max77693->irq_domain, muic_irq->irq);
-		if (!virq)
+		if (!virq) {
+			ret = -EINVAL;
 			goto err_irq;
+		}
 		muic_irq->virq = virq;
 
 		ret = request_threaded_irq(virq, NULL,
@@ -702,8 +704,6 @@ static int __devinit max77693_muic_probe(struct platform_device *pdev)
 				" error :%d)\n",
 				muic_irq->irq, ret);
 
-			for (i = i - 1; i >= 0; i--)
-				free_irq(muic_irq->virq, info);
 			goto err_irq;
 		}
 	}
@@ -768,6 +768,8 @@ static int __devinit max77693_muic_probe(struct platform_device *pdev)
 err_extcon:
 	kfree(info->edev);
 err_irq:
+	while (--i >= 0)
+		free_irq(muic_irqs[i].virq, info);
 err_regmap:
 	kfree(info);
 err_kfree:
-- 
1.7.4.1

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